Shoe bottom filling machine



Feb. 26, 1952 1.. GARRAT'i' ETAL 2,586,933

SHOE BOTTOM FILLI NG MACHINE Filed Jan. 5, 1951 15 Sheets-Sheet l Inventors Leslie Garm Percy White Feb. 26, 1952 V L. GARRATT ETAL 2,586,933

SHOE BOTTOM FILLING MACHINE Filed Jan. 3, 1951 15 Sheets-Sheet 2 J25 Fgg Z o I 1J Q 9 o Q 67 0 9 5[ 4 Y Q o 247 383 245 97 268 259 3.51 Q o I I o 405 Q 57 34.9 6 55 G H 43 I Inventors Leslie Garrait Percy White By their Attorney Feb. 26, 1952 1 GARRATT E L 2,586,933

SHOE BOTTOM FILLING MACHINE Filed Jan. 3, 1951 15 Sheets-Sheet 3 In veniors 7 Leslie Garrdff. 353 Percy Vl hz'fe.

1952 L. GARYRATT ET AL SHOE BOTTOM FILLING MACHINE l5 Sheets-Sheet 4 Filed Jan. 3, 1951 S rm mm nw G D .H

Pergy White 53 their Attorney L. GARRATT ETAL. 2,58 33 SHOE BOTTOM FILLING MACHINE l5 Sheets-Sheet 5 Feb. 26, 1952 Filed Jan. 3, 1951 nzzen fora Leslie Garrazf -Perc y W/u' ze yf/Leir flffo-rne 3115M, mm. mwwn Feb. 26, 1952 L. GARRATT ETAL SHOE BOTTOM FILLING MACHINE l5 Sheets-Sheet 6 Filed Jan. 5, 1951 In u0ni0r5 Leslie Garraii 1952 L. GARRATT ETAL SHOE BOTTOM FILLING MACHINE 15 Sheets-Sheet '7 Filed Jan. 3, 1951 Inven z ors Leslie Garrqii I Percy W/u'ze Feb. 26, 1952 L. GARRATT ETAL SHOE BOTTOM FILLING MACHINE l5 Sheets-Sheet 8 Filed Jan. 5, 1951 fin awn gm 3 a a Q %n Q G M? mmm hum

hm bun In veni 0 rs.

L szze' Garma. Pergl/ mife Feb. 26, 1952 L. GARRATT ETAL 2,586,933

SHOE BOTTOM FILLING MACHINE Filed Jan. 3, 1951 15 Sheets-Sheet 9 In ventors Leslie Garrczif Percy Whife By illel'r/ffforney Feb. 26, 1952 GARRATT ETAL 2,586,933

SHOE BOTTOM ILLING MACHINE Filed Jan. 5, 1951 15 Sheets-Sheet l0 In veniars. Leslie Garrazz. Percy W/u'ze By zfheirflz forn 6y.

Feb. 26, 1952 GARRATT ETAL SHOE BOTTOM FILLING MACHINE l5 Sheets-Sheet 11 Filed Jan. 5, 1951 Q mi L. GARRATT ETAL SHOE BOTTOM FILLING MACHINE Feb. 26, 1 952 Filed Jan. 3, 1951 I 15 Sheets-Sheet 12 \|1 PM, 0& ZZW mpmm mwf e v u i 1 99% p fmd sHo BOTTOM FILLING MACHINE Filed Jan. 3. I951.

15 Sheets-Sheet l3 538 Invenlars 57' Lesllje Garraff I Percy ZV/u'ze By f/z eirfl z z orney Feb. 26, 1952 I GARRATT EFAL 9 2,586,933

- SHOE BOTTOM FILLING MACHINE Filed Jan. 3, 1951 15 Sheets-Sheet 14 [nveniors Les/[e Farr-a it Percy W/u'fe By hez'rAttarney 1952 L. GARRATT ET AL ,586, 33

SHOE BOTTOM FILLING MACHINE Filed Jan. 3, 1951 15 Sheets-Sheet l5 Inventors Leslie Garratt Percy VV/ulze By their Attorney Patented Feb. 26, 1952 SHOE BOTTOM FILLING MACHINE Leslie Garratt, Leicester, and Percy White, Worcester Park, England, assignors to United Shoe Machinery Corporation, Flemington, N. J a corporation of New Jersey Application January 3, 1951, Serial No. 204,112 In Great Britain January 28, 1950 7 Claims.

This invention relates to machines for filling the cavities in shoe bottoms, and more particularly to improvements in shoe bottom filling machines of the type disclosed in the United States Letters Patents No. 2,465,417, granted March 29, 1949 in the names of C. M. Bagshaw, F. C. Choice and J. W. Pratt and No. 2,465,501, granted, as of the same date, in the name of P. White.

In the use of machines of the type herein considered, bottom filling material such as a mixture of ground cork and a binder is placed in the cavity which customarily exists in accordance with general shoemaking practice, in the central portion of the forepart of a shoe bottom after a marginal portion of the upper materials has been lasted over an insole or like shoe-bottom member and prior to the application of an outsole to the shoe-bottom. In the case of a shoe of the McKay type the cavity is bounded by the overlasted marginal portion of the upper materials and, in the case of a shoe of welted construction, the cavity is bounded by the upstanding lip or -rib on the insole to which the overlasted margin of the upper is secured.

The machine disclosed in each of the patents referred to comprises a matrix device including a flexible diaphragm which is arranged to bridge the cavity in the bottom of a shoe held thereagainst so that the diaphragm engages the portions of the shoe bounding the cavity. Each machine also includes means for clamping the shoe firmly against the diaphragm which may thereby become distorted so that marginal portions thereof follow the contours of the shoe bottom and generally accommodate themselves to irregularities in the height of the bounding wall of the cavity so as efiectively to seal the latter along the sides and around the toe end of the shoe bottom.

The machine disclosed in each of said patents also has a reciprocatory device comprising a plunger and an associated pick-up sleeve arranged, at times, to overhang the operative end of the plunger which is arranged to move through a mass of filling material (conditioned by the application of heat and by agitation of the material in an agitating drum therefor) and to separate a quantity of the conditioned (i. e. fluent) bottom filling material from the mass thereof and to urge it through the matrix device and into the cavity.

In order that a complete cycle of operations of the machine may be accomplished in a short time and yet ensure that at least a latter portion of the bottom-filling operation may take place at low speed to give the operator time to appreciate that the filling operation is completed and consequently to operate a by-pass valve to terminate the extrusion of material before an excess of material is delivered to the shoe bottom, the machines disclosed in the patents are provided with mechanical clutch devices (high speed and low speed) and operating mechanism therefor which were so organized that the machine cycle commenced at a relatively high speed but, at a predetermined time during the advancing movement of the plunger, the drive was transferred via a two-speed clutch device which continued the operation at a slower speed until, on the cavity being filled, the operator actuated the bypass valve aforesaid, the drive then being transferred back to the high-speed clutch device and the cycle completed at high speed. The actuation of the by-pass valve at the end of the cavityfilling operation also resulted in the unclamping of the shoe.

While machines constructed as disclosed in the patents referred to above have proved capable of giving very good results, the means for cutting off the supply of filler material to each shoe and the somewhat complicated mechanical clutch devices and associated mechanism have not always proved as fully eificient as is desirable. The twospeed clutch devices, when operating satisfactorily demonstrated that, without doubt, the ability of the machine to run at two speeds during the cycle of operations resulted in a general saving of time but, in spite of this fact, the mechanical weaknesses of the clutch mechanism have not proved themselves easy to eradicate nor has any suitable and more reliable form of mechanical arrangement suggested itself.

The object of the present invention is to provide an improved shoe bottom filling machine which is reliable and conducive to efiicient control on the part of an operator and is not as complex in construction as machines heretofore conceived for carrying out equivalent operations.

To this end and in accordance with an important feature of the invention, a matrix box or diaphragm is provided for forming a seal with the bottom of a shoe, the box or diaphragm being in combination with a two Way or cut-off and by-pass valve which is reliably effective for its cut-off action in a plane approximately that of the matrix regardless of any variation in the consistency or fluidity of the particular bottom filling composition employed. 7

One other feature is the matrix box or diaphragm mounted in an inclined position for improved observation by an operator.

Another feature of the invention is a fluid pressure operated means or system for effecting the extrusion or bottom filling operation.

An additional feature is a multiple-speed fluid pressure operated drive in combination with automatic means for changing the speed together with a manual control for timing the operation of the automatic means.

These and other features of the invention in cluding various novel details of construction and combinations of parts will 'be described as embodied in two forms of the machine illustrated and as pointed out in the appended claims.

In each of the machines illustrated a matrix device is employed that is "similar in some respects to those disclosed in the patents referred to and also shoe clamping means for clamping a shoe with portions of the shoe bottom surrounding the sides and toe end of the cavity firmly in engagement with a diaphragm of the matrix device so that the cavity is bridged by the diaphragm, means comprising a reciprocatory plunger and an associated pick-up sleeve for introducing fillingmaterial between the diaphragm bridging the cavityand the shoe bottom to fill the cavity, and mechanical as well as fluidpressure operated means for operating the shoe clamping means and the means for introducingthe filling material into the cavity together with means for coordinatingthe action of various of the operating instrumentalities of the machine through appropriate operation of valve devices associated with said fluid-pressure operated means.

In the illustrative machines hereinafter described the fluid-pressure operated means comprises two pumps, viz. a high capacity pump and a low capacity pump. Thehigh capacity pump is arranged to deliver oil, when permitted to do so, at a rate of some 13 gallons per minute to a hydraulic circuit associated with a piston and cylinder device for operatingthe'reciprocatory plunger and its pick-up sleeve and with piston and cylinder devices for operating shoe clamping means and a cut-off valve associated with the matrix device. The low capacity pump is arranged to deliver oil to the hydraulic circuit at a rate of some 1 1 gallons per minute. The fluid-pressure operated means also comprises valve gear for controlling the flow of oil in the hydraulic circuit. An operator-controlled treadle device is provided in the illustrative machines hereinafter described for actuating the valve gear to eifect clamping of a shoe in operative position, for initiating a cavity-fillingoperation and for eventually terminating that operation and causing unclamping of the shoe.

Forward movement of the plunger commences at high speed, both pumps supplying oil to the piston and cylinder device actuating the plunger, and a cam-actuated lever, actuated in time relation to the movement of the plunger, automatically cuts out the supply of oil from the high-capacity pump at a predetermined time duringthe forward stroke of the plungerso that the speed of movement thereof is materially reduced (to approximately one-tenth of its fast speed) to permit the cavity-filling operation to be terminated at low speed for the purpose above referred to.

When the operator wishes to terminate the cavity-filling operation he will release the treadle device whereupon the shoe clamping means is caused to release the shoe, the cut-ofi valve automatically sealing the extrusion duct through the matrix device at a locality substantially level with the diaphragm, and the high-capacity pump is reconnected with the portion of the hydraulic circuit feeding the piston and cylinder device actuating the plunger to cause the latter to complete its forward stroke, and to return to its fully withdrawn position, at high speed, a reversing valve automatically changing over the direction of movement of the plunger at the appropriate times. Surplus filling material picked up by the plunger and pick-up sleeve is returned to the agitating drum.

It will thus be appreciated that the two-speed movement of the plunger and pick-up device is efiected without the employment of complicated mechanical clutch devices, and, from the following description, it will be seen that this movement and the coordination and timing of the operation of the shoe clamping means and the cavity-filling means is effected by fluid pressure operated means controlled by valve control gear of a relatively simple character.

In the accompanying drawings,

Fig. l is a front elevation of a machine embodying the present invention;

Fig. 2 is a right-hand side elevation of themachine shown in Fig. 1;

Fig. 3 is an enlarged view of the shoe clamping means, cut-off valve and parts associated therewith as seen in Fig. 2, a portion being broken away for ease of illustration;

Fig. 4 is a view partly in section of the mechanism shown in Fig. 3;

Fig. 5 is a right-hand side elevation of the base portion of the machine shown in Fig. 1;

Fig. 6 is a right-hand side elevation of the uper portion of the machine shown in Fig. 1 and with some parts broken away for ease of illustration; I

Fig. '7 is a view taken along the lines VIIVII in Figs. 5 and 6;

Fig. 8 is a longitudinal section of a piston and cylinder device for operating an extrusion plunger and pick-up device;

Fig. 9 is a longitudinal section of a shoeclamping control valve and a speed control valve;

Fig. 10 is a longitudinal section of a reversing valve;

Fig. 11 is a right-hand side elevation with some parts in section and others broken away showing valve controlling mechanism employed in the illustrative machine;

Fig. 12 is a front view partly in section showing valve controlling mechanism employed;

Fig. 13 is a schematic diagram of the hydraulic circuit and associated parts of the machine;

Fig. 14 is a right-hand side elevation of portions of a modified form of the machine, part of the machine being shown in dot-and-dash lines;

Fig. 15 is a right-hand side elevation of parts seen in Fig. 14 but drawn to a larger scale;

Fig. 16 is a plan view of parts shown in Fig. 15;

Fig. 17 is a righthand side elevation of the matrix box with parts broken away showing a modified form of cut-off valve;

Fig. 18 is a view in the direction of the arrow shown in Fig. 17;

Fig. 19 is a detail plan view of parts associated with the valve shown in Figs. 17 and 18;

Fig. 20 is a detail view of the valve and parts associated therewith as viewed from below; and

Fig. 21 is a right-hand side elevation of a treadle actuated arrangement and associated carried thereon. The base portion consists of two side members in the form of plate-like castings which are substantially rectangular in outline and have substantially rectangular portions removed from their midportions as is seen in Fig. 2. The side castings have reinforcing ribs cast integrally therewith. The side members 5 are connected together by means of three square-sectioned upper tie bars 1 (Figs. 5 and 6) and four lower tie bars 9 (Fig. 5) extending widthwise of the machine, these tie bars bridging between the side members at the top and bottom thereof and being'spaced apart in a direction extending from front to rear of the machine.

The head casting 3 bridges between the upper ends of the side members 5 of the base portion of the main frame at the front of the machine. The head casting carries a drum N (Fig. 6) for conditioning bottom filling material prior to its application to shoe bottom cavities, the drum comprising stationary front and rear walls 13 and I5 respectively and a rotatable cylindrical wall I? extending therebetween all substantially as described in above-mentioned Letters Patent No. 2,465,417 with reference to the drum 2i described therein. Within the drum is a baflle I6 (Figs. 6 and '7) which, though differing somewhat in actual construction from that referred to as the plate 3! in said Patent No. 2,465,417, serves a similar purpose thereto. The bafile is secured to the stationary front and rear walls l3 and I5 of the drum. The rear wall I5 is secured to a rear upstanding portion 4 of the casting 3, the latter also having a hollow plate-like member l9 (Figs. 1 and 6) secured to the front thereof, this member extending across the machine and having a plate forming the front wall 13 of the drum secured to it. A door 20 is hingedly mounted on the member l9 and normally closes an opening therei providing access to the interior of the drum when required. The plate-like member l9 also carries a matrix device 2| (Fig. 4) which is somewhat similar to the matrix device 5 described in the prior Letters Patent No. 2,465,417, in that it has a flexible diaphragm 23 (Figs. 1, 3 and 4) which is arranged to engage marginal portions of a shoe bottom surrounding a cavity therein which is to be filled by the machine and means for supporting the diaphragm including a matrix box 25 and a plurality of fingers 27 therein which. are spring pressed into supporting engagement with the back face of the diaphragm. The matrix device in the illustrative machine now being described is so mounted that the diaphragh 23, instead of being generally horizontal as in the machine disclosed in said Patent No. 2,465,417, occupies a position in which it extends downwardly and rearwardly in the machine (i. e. away from the operator) at an angle of some 35 to the horizontal. This arrangement of the matrix device enables the operator more readily to observe the heelward end of the shoe bottom cavity and so determine the instant at which the filling operation should be terminated. In presenting a shoe to the machine the operator will hold the shoe, bottom upwards but with the toe end pointing downwardly and away from him, in position against the diaphragm 23 while shoe clamping means is brought into operation as hereinafter described to clamp the shoe in position against the diaphragm with suihcient pressure to ensure 75 that the diaphragm is distorted by engagement of the marginal portion of the shoe bottom there with, against the action of the spring-pressed supporting fingers 21, in such manner that the 5 diaphragm bridges the cavity and effectively seals the cavity along the side walls thereof in preparation for the cavity filling operation.

For introducing filling material into the cavity between the diaphragm and the shoe bottom the illustrative machine is provided with a movable device comprising a reciprocatory plunger 29 (Fig. 6) and a pick-up sleeve 3! associated therewith which plunger and sleeve correspond to the plunger I9 and sleeve described in said Letters 15 Patent No. 2,465,417. The plunger 29 and pick-up sleeve 3| operate substantially in the manner described in said Patent No. 2,485,417, to pick up a quantity of filling material from a mass thereof in the agitatin drum l l and then to extrude the filling material so picked up into a cylinder '33 in a casting 35 (Figs. 3 and 6) to which the matrix device is secured and which itself is secured to the plate-like member IQ forming the front wall of the head casting. From the cylinder 33 the material is extruded into the cavity in the shoe bottom through a duct 31 (Fig. 3) extending through the matrix device, the duct having a cuton? valve 39 associated therewith. The valve 39 is somewhat similar to the valve referred to as the valve rod I66 in the prior Letters Patent No.

2,465,501 to White in that it comprises a plunger mounted for movement in a direction at least substantially perpendicular to the general plane of the matrix 23. The cut-off valve 39 in the illustrative machine now being described is arranged, prior to the clamping of a shoe in operative position in the machine, to be seated on a valve seating substantially in the plane of the matrix 23 so as to close the duct through the 40 matrix device.

treadle 43 (Figs. 1 and 2) which the operator may actuate (a) to efiect clamping of the shoe; and to initiate the bottom-filling extruding action of the machine; and (b) to terminate the cavity-filling operation and to release the shoe when he observes that the cavity has been sufficiently filled. Actuation of the treadle to release the shoe automatically causes the valve 39 (Fig. 3) to be reseatedon the valve seating above referred to so that the duct 31 through the matrix device is closed before the shoe is fully unclamped. The valve 39 is so constructed an arranged that, at the termination of the cavity-filling operation, it occupies such a position (see Fig. 3) that surplus filling material is (iiverted back to the drum II via a passage 44 in the valve stem and a duct 45 on the casting 5 35 as the reciprocatory plunger 29 completes its forward or Working stroke. When the valve is raised during the filling operation the passage.

44 does not communicate with the cylinder 33. In the illustrative machine use is made of fluid-pressure operated means for actuating the shoe-clamping means and the reciprocatory plunger and pick-up sleeve device. In order that at least a final portion of the actual bottomfilling extrusion operation may take place at a relatively slowspeed (so that the operator may unit.

carried.

more readily be able to terminate the filling operation at the correct instant) while other portions of the machine cycle are effected at a relatively high speed (so as to minimize the time taken for a complete cycle of operations) the fluid-pressure operated means comprises two pumps-a high capacity pump I (Figs. 5 and '1) and a low-capacity pump 53-which at times are working in conjunction but, during a porticn, at least, of the actual extrusion operation, the low-capacity pump alone is efiective in operating the plunger 29.

The pumps 5| and 53 are both mounted in a box-like casting 55 (Figs. 5 and 7) and are of the rotary type, being driven continuously from an electric motor 51 secured in the base portion of the machine frame. The casting 55 is bolted to two of the lower tie bars 9 above a base plate 59 which also carries the motor 51.

The motor 51 has a double driving pulley 59 which, by means of belts BI, drives a pulley 63 secured on an end portion of a shaft 65 (Fig. 5) which projects outwardly from the casting in hearings in which the shaft is journalled The shaft 55 is directly coupled to the high capacity pump shaft by means of an Oldham cou pling E1. The low capacity pump 53 is driven from the high capacity pump shaft through reduction gearing 59, 1| (Fig. '7).

The shaft 55 also has thereon a worm gear 13 engaging a worm wheel 15 secured on a shaft i1 journalled in bearings in the casting 55. A portion of the shaft 11 extends outwardly through the casting and has secured thereon a sprocket wheel 19 (Fig. 5) which, through a chain 8! (Figs. 5 and '7), drives asprocket wheel 83 (Figs. 6 and '7). The sprocket wheel 93, in turn, rotates the drum I! through a friction clutch 85 (Fig. 6), the drive to the drum (and the method of supporting the drum) being-substantially as described in said Patent No. 2365,417, with reference to the drum 2I described therein. The tension in the chain 81 is determined by a spring 82 (Fig. '7) connected to a bell-crank lever 84 carrying an idler sprocket wheel 35.

In the pump casting 55 is provided an oil reservoir 91 (Fig. 5) oil being admitted to the reservoir by means of a filler opening normally closed by a filler cap 95. A filter unit 91 (Fig. 5) is detachably secured to the rear of the casting 55 and exhaust oil from the hydraulic system is returned to the reservoir 9I through the filter Oil from the reservoir is admitted to the pumps through appropriate intakes (not shown) and oil is fed by the high capacity pump 51 into the hydraulic circuit( hereinafter described) via an outlet pipe 99 (Figs. 5 and '7) while the low capacity pump 53 feeds the hydraulic circuit via an outlet pipe NH.

The shoe-clamping means is operated by fluidpressure operated means and will now be described. Extending between the side members 5 are two horizontal and transverse rods III, H3. (Figs. 2 and 3) which extend through trans-' verse bores in a rear portion of a box-like casting H5 (see also Figs. 1 and 4) so as to support the latter. The casting H5 serves to house switchgear hereinafter described and also carries a transversely extending horizontal'rod II1 on end portions of which two-members II!) are The members H9 have threaded into them (Figs. 3 and 4) lower end portions of tie rods (2! (one at either side of the machine) which extend upwardly and rearwardly and,

all

have upper end portions secured by bolts I24 to arms I23 extending outwardly from the casting (Fig. 3) supporting the matrix box 25.

Supported by the tie rods I2I is a casting l25 which extends between the tie rods and is located lengthwise thereof by means of collars I25 and locking collars I28 threaded on to lower portions of the tie rods. The casting I25 is secured in position upon the tie rods by means of clamping bolts I39 (Fig. 4.).

The casting I25 has centrally formed therein a cylinder I21 the axis of which lies parallel to the axes of the tie rods I2 I. Within the cylinder are two opposed pistons I29 and I3I. The piston I29 has a piston rod I33 secured therein and a light spring I35 surrounds the piston rod and is received between the piston I29 and the upper end wall of the cylinder I21. The piston rod is restrained against rotation by means of a stud I31 threaded through the upper end wall of the cylinder and received within a longitudinal guideway I39 in the piston rod I33. Secured to an upper end portion of the piston rod I33 is a block I4I having ribs I projecting laterally therefrom. The ribs are received within guideways in a member M3 on which is carried a shoe supporting rubber pad I41. The pad I41 is shaped to receive the vamp portion of a shoe on a last and is arranged to thrust the shoe upwardly so that marginal portions of the shoe bottom surrounding the cavity to be filled are thrust firmly into engagement with the diaphragm 23. The member I33 carrying the pad I41 is adjustable, lengthwise of the shoe, on the ribs I45, on the block MI. The member I43 is clamped in adjusted position on the block by means of a clamping screw I49.

The piston I3I has a downwardly extending piston rod I5I secured therein, the piston rod I5I extending through a lower end wall of the cylinder I21 provided by a plate I53. A spring I55, somewhat stronger than the spring I35, surrounds the piston rod I5I between the piston I3I and the plate I53 and normally urges the piston upwardly until a bifurcated head portion I51 on the piston 7 rod I5I engages the plate I53. The head portion I51 is pivotally connected to a transversely extending lever I59 between the ends thereof. As seen from the front of the machine (Fig. 4) the right-hand end of the lever I59 is pivoted to a bracket IGI secured to, and depending from, the casting I25. The left-hand end of the lever I59 is pivotally connected to a lower end of aconnesting rod 163 which extends upwardly and rearwardly, parallel to the axes of the tie rods I2I, and at its upper end is pivoted to a transversely extending valve operating lever I61.

The lever I61 is pivotally mounted, midway between its ends, on a pin I69 carried by the casting 35 supporting the matrix box 25. The

lever is received within an aperture in the casting and has a bifurcated right-hand end portion (as seen from the front of the machine) the'limbs of which are received within recesses cut in a stem portion of the valve 39. The arrangement 7 is such that, when the piston I3I is held in its uppermost position in the cylinder I21 by means of the spring I the valve 39 is held against its seating to close the duct 31 through the matrix box. When, however, the piston I3I is thrust downwardly against the action of the spring I55,

as will be hereinafter described, the valve 39 is raised to open the duct through the matrix-box in preparation for a cavity filling operation.

For operating the pistons :I29 and I31 oil-is iiadmitted to a central portion of the cylinder I 21 through a, port I1I in the cylinder Wall, the port I 1| communicating with a pipe I13 leading from a shoe clamping control valve I15 (Fig. 3). The valve I15 is arranged, prior to the initiation of a cycle of operations by actuation of the treadle 43, to connect the pipe I13 with exhaust so that the springs I35 and I55 (Fig. 4) lower and raise the pistons I29 and I3I respectively. On actuation of the treadle 43 the valve I15 is arranged to disconnect the pipe I13 from exhaust and to connect it with an oil supply line as hereinafter described so that oil is admitted to the cylinder I21 via the port "I. At first the piston I29 is moved upwardly against the action of the spring I35 until upward movement of the pad I41 is resisted by engagement with the shoe. Then, as the pressure builds up in the cylinder I21, the pad thrusts the shoe bottom more firmly against the diaphragm and the piston I3I moves downwardly against the action of the stronger spring I55 to raise the cut-off valve 39.

Ports I11 and I19 (Fig. 3) are provided at upper and lower ends of the cylinder I21 and communicate with a pipe I80 (Fig. 4) the purpose of which is to drain away any oil seeping past the pistons I29 and I3I. For actuating the plunger 29 for effecting the extrusion of the filling material into the shoe bottom cavity the following arrangement is provided.

A horizontally disposed cylinder I8I (Figs. 5, 6 and 8) provided with end caps I83 is secured to the undersides of two of the upper tie bars 1 of the base portion of the machine frame. A piston I85 operates within the cylinder and has a piston rod I81 extending rearwardly therefrom through a packing gland I89 in the end cap I83 at the rear of the cylinder IBI. A rear end portion of the piston rod I81 is secured to a cross head I9! which is guided for forward and rearward movement by guide bars I93 secured, at their forward ends, to the rear caps I83 and, at their rearward ends, to the rearmost tie bar 1.

The cross head I9I is connected by a link I94 (Figs. and 11) to a lower arm I95 of a lever secured, mid way between its ends, to a cross shaft I91 (Fig. 5) (see also Figs. 11 and 12) journalled in hearings in brackets I99, 200 and 292 (Fig. 12) secured to the side members 5 of the machine-frame or to two of the tie bars 1 (in the case of the bracket 200). The lever just referred to has an upper arm 20I (Fig. 6), an

upper end portion of which is connected, via a link 203, to a crosshead 295 on the rearward end of the plunger 29. The crosshead 295 (Fig. 6) is guided for reciprocatingmovements forwardly and rearwardly of the machine by means of two parallel guide rods 201 (Fig. 12) secured, at forward ends thereof, to the head casting 3 and, at rearward ends thereof, in bores in the bracket 209.

The plunger 29 extends forwardly through a bearing bore in a sleeve member 2 (Fig. 6) secured in a rear wall of a rearward box-like extension 2 I3 of the head casting 3. The pick up sleeve 3| is slidably mounted on a forward end portion of the plunger and a coil spring '2I5 received within an enlarged rear portion of the bore through the pick up sleeve (and held therein by means of a plug in the rear end of the bore) grips the plunger and ensures that the pick up sleeve moves with the plunger unless movement of the sleeve is arrested whereupon the plunger may move relatively to the sleeve. The sleeve 3! extends through the rear wall I5 of the drum II and into the box-like extension 2I3 of the head casting. The rearward end of the sleeve, '5

one of the end,

10 during the return (i. e. rearward) stroke of the plunger 29, engages an adjustable stop (described hereinafter) which arrests rearward movement of the sleeve while the plunger completes its rearward movement. At the completion of this movement the sleeve overhangs the front end of the plunger and the amount by which the sleeve sooverhangs the end of the plunger is determined by the setting of the adjustable stop just above referred to.

When it is desired to use the machine to fill cavities in the larger sizes of shoes the stop will be adjusted so that it arrests movement of the sleeve earlier in the return stroke of the plunger so that, at the conclusion of the return stroke of the plunger, the sleeve overhangs the forward end of the plunger a considerable amount. This ensures that, on the next forward stroke of the plunger and sleeve, a relatively large amount of filling material will be picked up by the sleeve. When it is desired to use the machine to operate onsmall shoes the stop will be set further rearwards in the machine so that movement of the sleeve is not arrested until a later time during the return stroke of the plunger thus resulting in a smaller overhang of the sleeve. Under these circumstances, during the next forward stroke of the plunger and sleeve, the amount of filling material picked up by the sleeve will be smaller than in the previous case. Forward movement of the sleeve is arrested by engagement of the front end of the sleeve with the rear end of portions of the casting 35 providing the cylinder 33 and, on further forward movement of the plunger, material picked up by the sleeve is extruded into the cylinder 33 and thence through the matrix box as described in the Patent No. 2,465,417, above referred to. By suitable adjustment of the stop the operator may ensure that the change over to slow speed of the extruding device occurs just before the cavity filling operation is ready for'termination whatever be the size of the shoe being operated upon.

The adjustable stop for determining the amount by which the pick up sleeve overhangs the front end of the plunger 29 is provided by a bifurcated upper end portion of an arm 22I (Fig. 6) (see also Fig. 7) which is secured to (and projects upwardly from) a cross shaft 223 journalled in bearings in the extension 2I3 of the head casting 3. The bifurcated portion of the arm 22I embraces the plunger 29 at a locality to the rear of the pick up sleeve. The shaft 223 has secured thereon a worm wheel 225 (Fig. '7) engaged by a worm gear 221 secured to a shaft 229 extending forwardly (Fig. 6), through beare ings in the head casting 3, to the front of the machine where it is provided with a hand knob 23I by which the shaft 229 may readily be rotated by the operator to adjust the stop formed by the arm 22I forwardly or rearwardly in the machine. The end caps I83 of the cylinder I8I are provided with ports 233, 234 (Fig. 8) communicating with the opposite ends of the cylinder and flow of oil to and from the cylinder is controlled by a reversing valve 235 (Figs. 7 and 10) and by a speed control valve 231 (Figs. 5, '1 and-9).

The hydraulic circuit will now be-described.

Oil from the low capacity pump- 53 (Figs. 5, '1 and 13) is fed via the pipe I0! to a junction 243 (Fig. 5) which communicates, via a pi e 245, with a pressure gauge 241 (see also Fig. 13) for indicating the pressure of oil supplied by the low capacity pump. The junction 243 alsocommunicates, Via a pipe 249, with a second junction 

